CN111355361A - Coupling inductance grid drive circuit for realizing eGaN HEMT parallel dynamic current sharing - Google Patents
Coupling inductance grid drive circuit for realizing eGaN HEMT parallel dynamic current sharing Download PDFInfo
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- CN111355361A CN111355361A CN202010020445.1A CN202010020445A CN111355361A CN 111355361 A CN111355361 A CN 111355361A CN 202010020445 A CN202010020445 A CN 202010020445A CN 111355361 A CN111355361 A CN 111355361A
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- coupling
- coupling inductor
- tube
- inductor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
Abstract
The invention discloses a coupling inductance grid driving circuit for realizing parallel dynamic current sharing of an eGaN HEMT, which comprises a voltage totem pole structure unit connected between a positive power supply and a negative power supply, and a coupling inductance driving unit connected with the voltage totem pole structure unit, wherein the coupling inductance driving unit comprises a first driving resistor, a first diode, a second driving resistor, a second diode, a first coupling inductance and a second coupling inductance. The coupling inductor driving circuit is connected to the grid electrode of the second power tube through the secondary side of the first coupling inductor, and is connected to the grid electrode of the first power tube through the secondary side of the second coupling inductor, and the first power tube and the second power tube are connected in parallel. The driving circuit provides a compensation signal for the grid electrode through the coupling inductor, and achieves parallel dynamic current sharing while meeting the requirement of an eGaN HEMT high-speed switch.
Description
Technical Field
The invention belongs to the technical field of power electronics and electricians, relates to a driving circuit suitable for an eGaN HEMT, and particularly relates to a coupling inductance grid driving circuit for realizing parallel dynamic current sharing of the eGaN HEMT.
Background
The gallium nitride (GaN) device is one of the representative devices of the novel wide bandgap semiconductor, has the advantages of lower on-resistance, higher switching speed, higher junction temperature working capacity and the like compared with a Si device, and is expected to remarkably improve the highest working frequency and efficiency of the converter and reduce the volume and weight of the converter by replacing the Si device as a power device for manufacturing the converter.
The current rating of the existing commercial GaN devices is relatively low, and cannot meet the requirement of a system with a large capacity, so that the working current of the existing commercial GaN devices can be enlarged in a parallel connection mode. In actual use, due to factors such as device parameter dispersion and circuit parameter asymmetry, the problem of uneven current of parallel devices can be caused.
In the existing literature, methods such as parallel device screening, symmetrical layout design, impedance balance, gate resistance compensation and the like are proposed for solving the problem of parallel non-uniform current in the application of a GaN-based parallel circuit, but all the methods have certain limitations, the design of the methods partially or completely depends on the screening and layout design of the parallel devices, the circuit does not have the function of actively controlling current imbalance, and the practical application value is limited.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the prior art, the coupling inductance grid drive circuit for realizing the parallel dynamic current sharing of the eGaN HEMT is provided, the dynamic current sharing of the eGaN HEMT parallel circuit is realized while the high-speed switching performance advantage of the eGaN HEMT is fully exerted, and the parallel eGaN HEMT is driven with high reliability.
The technical scheme is as follows: a coupling inductance grid driving circuit for realizing parallel dynamic current sharing of an eGaN HEMT is connected to an eGaN HEMT power circuit, the eGaN HEMT power circuit comprises a first power tube and a second power tube which are connected in parallel, the coupling inductance grid driving circuit comprises a voltage totem-pole structure unit connected between a positive power supply and a negative power supply, and a coupling inductance driving unit connected with the voltage totem-pole structure unit; the coupling inductance driving unit comprises a first driving resistor, a first diode, a second driving resistor, a second diode, a first coupling inductor and a second coupling inductor, and is connected to the grid electrode of the second power tube through the secondary side of the first coupling inductor and connected to the grid electrode of the first power tube through the secondary side of the second coupling inductor.
Furthermore, the voltage totem-pole structure unit comprises a first switch tube and a second switch tube, wherein the drain electrode of the first switch tube is connected with a positive power supply, the source electrode of the first switch tube is connected with the drain electrode of the second switch tube, and the source electrode of the second switch tube is connected with a negative power supply.
Furthermore, in the coupling inductor driving unit, one end of a first driving resistor and a cathode of a second diode are connected between a first switching tube and a second switching tube, the other end of the first driving resistor is connected with an anode of a first diode, an anode of the second diode is connected with one end of a second driving resistor, and the other end of the second driving resistor and the cathode of the first diode are connected with the non-homonymous ends of secondary sides of the first coupling inductor and the second coupling inductor; the dotted terminal of the secondary side of the first coupling inductor is connected with the grid electrode of the second power tube, the dotted terminal of the secondary side of the second coupling inductor is connected with the grid electrode of the first power tube, the dotted terminal of the primary side of the first coupling inductor is connected with the source electrode of the first power tube, and the non-dotted terminal of the primary side of the first coupling inductor is grounded; the primary side homonymous end of the second coupling inductor is connected with the source electrode of the second power tube, and the primary side non-homonymous end of the second coupling inductor is grounded.
Has the advantages that: compared with the prior art, the invention adopting the technical scheme has the following technical effects:
(1) when dynamic unbalanced current occurs, the circuit dynamically adjusts the switching speed of the power tube in real time, so that the current of the parallel devices tends to be balanced;
(2) the parallel devices share the switching loss, so that the normal working life of the devices can be maintained;
(3) the invention can improve the system efficiency.
Drawings
FIG. 1 is a circuit diagram of a voltage totem-pole configuration unit in accordance with the present invention;
FIG. 2 is a coupled inductive drive unit of the present invention;
fig. 3 is a circuit diagram of the present invention.
Detailed Description
The invention is further explained below with reference to the drawings.
As shown in fig. 3, the present invention is a coupled inductor gate driver circuit for implementing parallel dynamic current sharing of an edan HEMT, which is connected to an edan HEMT power circuit. The eGaN HEMT power circuit comprises a first power tube and a second power tube which are connected in parallel. The coupling inductance grid driving circuit comprises a voltage totem-pole structural unit connected between a positive power supply and a negative power supply and a coupling inductance driving unit connected with the voltage totem-pole structural unit. The coupling inductance driving unit comprises a first driving resistor, a first diode, a second driving resistor, a second diode, a first coupling inductance and a second coupling inductance. The coupling inductor driving unit is connected to the gate of the second power transistor through the secondary side of the first coupling inductor, and is connected to the gate of the first power transistor through the secondary side of the second coupling inductor, which will be described separately below.
As shown in fig. 1, the circuit diagram of the voltage totem-pole structure unit includes a first switch tube S1And a second switching tube S2Wherein, the first switch tube S1Is connected with a forward power supply UG,onA first switch tube S1Is connected with the second switch tube S2Drain electrode of (1), second switching tube S2The source electrode of the power supply is connected with a negative power supply UG,off。
As shown in fig. 2, is a coupled inductor driving unit, which is driven by a coupled inductorThe cell includes a first drive resistor RG,onA first diode D1A second driving resistor RG,offA second diode D2And a first coupling inductor M1And a second coupling inductor M2. Wherein the first driving resistor RG,onAnd a second diode D2Is connected to the first switch tube S1A second switch tube S2First driving resistor RG,onIs connected with a first diode D1Anode of (2), second diode D2Anode of (2) is connected with a second driving resistor RG,offOne terminal of (1), a second driving resistor RG,offAnother terminal of and a first diode D1Cathode of (3) is connected with a first coupling inductor M1And a second coupling inductor M2The minor edge of (a) is not a homonymous end. First coupling inductor M1Secondary side homonymous terminal and second power tube Q2Is connected with the grid of the second coupling inductor M2The first power tube Q is connected with the same name end of the secondary side1A gate electrode of (1). First coupling inductor M1Primary-side dotted terminal and first power tube Q1The non-homonymous terminal is grounded; second coupling inductor M2The primary side homonymous terminal is connected with a second power tube Q2The non-homonymous terminal of (1) is grounded.
The working principle of the invention is as follows:
first power tube Q1And a second power tube Q2Respectively flows into the first coupling inductors M1And a second coupling inductor M2And generating an induced voltage in a secondary winding of the two coupled inductors, a first coupled inductor M1And a second coupling inductor M2The structure of (a) is completely the same. Due to the first coupling inductance M1And the secondary winding of the secondary winding and the second coupling inductor M2Secondary windings of the two power tubes are respectively connected in series with the second power tube Q2And a first power tube Q1In the driving circuit of (1), therefore the first power tube Q1The actual gate-source voltage is the driving voltage value and the second coupling inductor M2The sum of the induced voltage values of the secondary winding and a second power tube Q2The actual gate-source voltage is the driving voltage value and the first coupling inductor M1Secondary edge windingThe sum of the group induced voltage values. Suppose a first power transistor Q1And a second power tube Q2The two parallel power tubes are completely consistent, the circuits are completely symmetrical, the currents flowing through the two parallel power tubes are equal, and the first coupling inductor M1And a second coupling inductor M2The induced voltage values generated on the secondary windings are also equal, and at the moment, the first power tube Q is connected with the secondary windings1Actual voltage value of grid source electrode and second power tube Q2The actual voltage values of the grid electrode and the source electrode are still equal, the switching speeds of the first power tube Q1 and the second power tube Q2 are consistent, and the dynamic current sharing process is achieved.
Generally, the current flows through the first power transistors Q connected in parallel due to the inconsistency between the device parameter and the loop parasitic parameter1And a second power tube Q2There is a deviation in the current of (2). If the current flows through the first power tube Q in the switching process of the power tube1Is larger than the current flowing through the second power tube Q2At the first coupling inductance M1The induced voltage generated on the secondary winding is greater than that of the second coupling inductor M2Induced voltage generated on the secondary winding, thereby the second power tube Q2The actual voltage of the grid source electrode is larger than that of the first power tube Q1And actual voltage value of the gate and the source. Because of the drain current i during the switching process of the power tubeDSatisfy the requirement of
iD＝gm(uGS-UGS(th))2(1)
Wherein, gmIs transconductance, uGSIs the actual voltage of the gate and source of the power transistor, UGS(th)Is the threshold voltage. From equation (1), the current flows through the second power transistor Q2The drain current of the power transistor is automatically increased, so that the difference of the drain currents of the two power transistors is reduced and tends to be consistent. Therefore, the dynamic current sharing of the two parallel power tubes is realized.
The invention provides a coupling inductance grid drive circuit for realizing parallel dynamic current sharing of an eGaN HEMT, which can realize the dynamic current sharing of the eGaN HEMT parallel circuit and realize high-reliability drive of the parallel eGaN HEMT while giving full play to the performance advantages of a high-speed switch of the eGaN HEMT.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (3)
1. The utility model provides a realize that eGaN HEMT connects dynamic coupling inductance grid drive circuit who flow equalizes in parallel, is connected to eGaN HEMT power circuit, eGaN HEMT power circuit includes parallelly connected first power tube and second power tube, its characterized in that: the coupling inductance grid driving circuit comprises a voltage totem-pole structural unit connected between a positive power supply and a negative power supply and a coupling inductance driving unit connected with the voltage totem-pole structural unit; the coupling inductance driving unit comprises a first driving resistor, a first diode, a second driving resistor, a second diode, a first coupling inductor and a second coupling inductor, and is connected to the grid electrode of the second power tube through the secondary side of the first coupling inductor and connected to the grid electrode of the first power tube through the secondary side of the second coupling inductor.
2. The coupled inductor gate drive circuit of claim 1 for implementing parallel dynamic current sharing of an eGaN HEMT, wherein: the voltage totem-pole structural unit comprises a first switch tube and a second switch tube, wherein the drain electrode of the first switch tube is connected with a positive power supply, the source electrode of the first switch tube is connected with the drain electrode of the second switch tube, and the source electrode of the second switch tube is connected with a negative power supply.
3. The coupled inductor gate drive circuit of claim 2 for implementing parallel dynamic current sharing of an eGaN HEMT, wherein: in the coupling inductor driving unit, one end of a first driving resistor and the cathode of a second diode are connected between a first switching tube and a second switching tube, the other end of the first driving resistor is connected with the anode of the first diode, the anode of the second diode is connected with one end of the second driving resistor, and the other end of the second driving resistor and the cathode of the first diode are connected with the non-homonymous ends of the secondary sides of the first coupling inductor and the second coupling inductor; the dotted terminal of the secondary side of the first coupling inductor is connected with the grid electrode of the second power tube, the dotted terminal of the secondary side of the second coupling inductor is connected with the grid electrode of the first power tube, the dotted terminal of the primary side of the first coupling inductor is connected with the source electrode of the first power tube, and the non-dotted terminal of the primary side of the first coupling inductor is grounded; the primary side homonymous end of the second coupling inductor is connected with the source electrode of the second power tube, and the primary side non-homonymous end of the second coupling inductor is grounded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010020445.1A CN111355361B (en) | 2020-01-09 | 2020-01-09 | Coupling inductance grid drive circuit for realizing eGaN HEMT parallel dynamic current sharing |
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| CN202010020445.1A CN111355361B (en) | 2020-01-09 | 2020-01-09 | Coupling inductance grid drive circuit for realizing eGaN HEMT parallel dynamic current sharing |
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| CN111355361B CN111355361B (en) | 2021-05-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111988023A (en) * | 2020-07-31 | 2020-11-24 | 南京理工大学 | Active current-sharing circuit and method for parallel connection of power tubes of solid-state power controller |
| CN115859889A (en) * | 2022-11-16 | 2023-03-28 | 广东工业大学 | Method for selecting drive resistor of eGaN HEMT power converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111988023A (en) * | 2020-07-31 | 2020-11-24 | 南京理工大学 | Active current-sharing circuit and method for parallel connection of power tubes of solid-state power controller |
| CN111988023B (en) * | 2020-07-31 | 2022-10-14 | 南京理工大学 | Active current-sharing circuit and method for parallel connection of power tubes of solid-state power controller |
| CN115859889A (en) * | 2022-11-16 | 2023-03-28 | 广东工业大学 | Method for selecting drive resistor of eGaN HEMT power converter |
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| CN111355361B (en) | 2021-05-25 |
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